St. Mark's rest : the history of Venice written for the help of the few travellers who still care for her monuments (1885)
Ruskin, John, 1819-1900 · New York : Lovell · leaf 345
icture ; p q the height of theobject itself ; s the Sight-j^oint; t the Station-point; n a pointat the direct distance of the object; though the object is sel-dom placed actually on the line t s produced, and may be farto the right or left of it, the formula is still the same. For let s, Fig. 3.,… … Fig. 3. here seen looking doum on its upper cdye, not sideways;—•then if the tower (representod liow, as on a map, by the darksqutu-e), instead of being at E en the line s t produced, be at =^ E, to the right (or left) of the spec-tator, still the appaient height of thetower on a b will be as s t…
Art
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